Merge branches 'maint/v1.0' and 'readme-cache-found' into maint/v1.1 #45

Job	Run time
Clear any existing caches	4s
Basic mainline test / Build and test	3m 48s
Check there's a current build cache	2s
Check a build won't create a new cache unnecessarily / Build and test	3m 30s
Check the build did use the extant cache	1s
	7m 25s

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